CN115441693A

CN115441693A - Display device

Info

Publication number: CN115441693A
Application number: CN202211102787.3A
Authority: CN
Inventors: 王立祥
Original assignee: Hisense Visual Technology Co Ltd
Current assignee: Hisense Visual Technology Co Ltd
Priority date: 2022-09-09
Filing date: 2022-09-09
Publication date: 2022-12-06

Abstract

The display device that this application embodiment provided includes: the backlight module comprises a first power supply circuit, a first control module and a backlight assembly; the first power supply circuit is connected with the backlight assembly, the first control module comprises a first driving unit and a first processing unit, the first processing unit is used for generating an adjusting signal in a digital signal format according to a feedback signal of the first power supply circuit, and the first driving unit is used for generating a driving signal for driving the first power supply circuit according to the adjusting signal. The embodiment can be well suitable for scenes of a high-power display device, and realizes effective power supply of the backlight assembly.

Description

Display device

Technical Field

The application relates to the technical field of display, in particular to a display device.

Background

A display device has a function of displaying an image viewable by a user, and is widely used in various places. Typically, the display device is equipped with a switching power supply to convert the mains (ac) into a supply signal matching the operating requirements of the display device.

In practical applications, the display device integrates a plurality of working modules, for example, the display device usually needs to supply power to an internal main board, a sound box, a backlight, and the like. In the related art, the power supply of these modules is usually controlled in an analog manner. However, as display technology has been developed, the size of display devices has gradually increased, and thus the power level of switching power supplies used for the display devices has also increased. For a high power display device, the conventional analog control scheme may not satisfy the switching power supply of the high power display device.

Therefore, it is desirable to provide a power supply scheme that can be adapted to high power display scenarios.

Disclosure of Invention

The application provides a display device, aiming at solving the technical problem that the traditional analog control scheme can not meet the requirement of a switching power supply of a high-power display device.

The application provides a display device including: a backlight assembly for providing a backlight; the first power supply circuit is connected with the backlight assembly and is used for receiving an alternating current input signal and generating a first power supply signal based on the alternating current input signal; the first power supply signal is used for supplying power to the backlight assembly; the first control module comprises a first driving unit and a first processing unit, the first processing unit is connected with the first driving unit, and the first processing unit is used for generating an adjusting signal in a digital signal format according to a feedback signal of the first power supply circuit; the first driving unit is connected with the first power supply circuit, and the first driving unit is used for generating a driving signal for driving the first power supply circuit according to the adjusting signal.

Optionally, the first power supply circuit includes a first ac-dc conversion circuit and a first dc-dc conversion circuit, and the first driving unit includes a first ac-dc driving unit and a first dc-dc driving unit; the first processing unit is connected with the first AC-DC driving unit and the first DC-DC driving unit, and is used for generating a first adjusting signal in a digital signal format according to a feedback signal of the first AC-DC conversion circuit; generating a second regulating signal according to a feedback signal of the first direct current-direct current conversion circuit; the first ac-dc driving unit is connected to a first ac-dc converting circuit, the first ac-dc driving unit is configured to generate a first driving signal for driving the first ac-dc converting circuit according to the first adjusting signal, and the first ac-dc converting circuit is configured to convert a received ac signal into a dc signal based on the first driving signal; the first direct-current driving unit is connected with a first direct-current conversion circuit, the first direct-current driving unit is used for generating a second driving signal for driving the first direct-current conversion circuit according to the second adjusting signal, and the first direct-current conversion circuit is used for performing voltage conversion on a received direct-current signal based on the second driving signal.

Optionally, the first processing unit includes: the input end of the first sampling unit is connected with the output end of the first AC-DC conversion circuit, and the first sampling unit is used for sampling the output voltage of the first AC-DC conversion circuit as a first feedback signal; the input end of the first comparing unit is connected with the output end of the first sampling unit, the output end of the first comparing unit is connected with the processing element, and the first comparing unit is used for comparing the first feedback signal with a preset first reference signal and outputting a first comparing result; the input end of the second sampling unit is connected with the output end of the first direct-current conversion circuit, and the second sampling unit is used for sampling the output voltage of the first direct-current conversion circuit as a second feedback signal; the input end of the second comparison unit is connected with the output end of the second sampling unit, the output end of the second comparison unit is connected with the processing element, and the second comparison unit is used for comparing the sampled second feedback signal with a preset second reference signal and outputting a second comparison result; a processing element to generate a first adjustment signal based on the first comparison result and a second adjustment signal based on the second comparison result.

Optionally, the display device further comprises an auxiliary power supply; the input end of the auxiliary power supply is connected with the input end of the first power supply circuit, the output end of the auxiliary power supply is connected with the first control module, the auxiliary power supply is used for receiving the alternating current input signal and generating a first auxiliary power supply signal based on the alternating current input signal, and the first auxiliary power supply signal is used for supplying power to the first control module.

Optionally, the auxiliary power supply includes: a first resistor; one end of the first resistor is connected with the input end of the first power supply circuit, and the other end of the first resistor is connected with the first control module.

Optionally, the auxiliary power supply further includes: a light coupling element and a first switching element; a control end of the first switching element receives a standby signal, one end of the first switching element is connected with a primary side output end of the optical coupler element, the other end of the first switching element is grounded, and the first switching element is used for being conducted when the standby signal is in a first state; and to turn off when the standby signal is in a second state; the primary side input end of the optical coupling element receives a first level signal, the secondary side input end of the optical coupling element is connected with the other end of the first resistor, and the secondary side output end of the optical coupling element is connected with the first control module.

Optionally, the auxiliary power supply further includes: one end of the second resistor receives the standby signal, and the other end of the second resistor is connected with the control end of the first switch element; one end of the third resistor is connected with the control end of the first switch element, and the other end of the third resistor is connected with the other end of the first switch element; and one end of the first capacitor is connected with one end of the third resistor, and the other end of the first capacitor is connected with the other end of the third resistor.

Optionally, the apparatus further comprises: a voltage regulator diode; the anode of the voltage stabilizing diode is connected with the auxiliary power supply, the cathode of the voltage stabilizing diode is connected with the mainboard of the display device, the auxiliary power supply is further used for outputting a second auxiliary power supply signal to the voltage stabilizing diode, and the second auxiliary power supply signal is lower than a rated power supply signal of the mainboard.

Optionally, the apparatus further includes a second switching element, one end of the second switching element receives the ac input signal, the other end of the second switching element is connected to the input end of the first power supply circuit, and a control end of the second switching element receives a control signal.

Optionally, the apparatus further comprises: the second power supply circuit, the second control module, the mainboard and the accompanying sound element; the second power supply circuit is connected with the mainboard and the accompanying sound element, and is used for receiving an alternating current input signal and generating a second power supply signal and a third power supply signal based on the alternating current input signal, wherein the second power supply signal is used for supplying power to the mainboard, and the third power supply signal is used for supplying power to the accompanying sound element; the second control module is connected with the second power supply circuit and used for generating a driving signal for driving the second power supply circuit according to a feedback signal of the second power supply circuit.

Optionally, the second power supply circuit includes: a second AC-DC converting circuit and a second DC-DC converting circuit; the driving signals of the second power supply circuit comprise a third driving signal and a fourth driving signal; the input end of the second AC-DC conversion circuit is connected with the input end of the first power supply circuit, and the second AC-DC conversion circuit is used for converting the received AC input signal into a DC signal according to the third driving signal; the input end of the second direct-current and direct-current conversion circuit is connected with the output end of the second alternating-current and direct-current conversion circuit, the output end of the second direct-current and direct-current conversion circuit is connected with the mainboard and the accompanying sound element, and the second direct-current and direct-current conversion circuit is used for performing voltage conversion on the received direct-current signal according to the fourth driving signal.

Optionally, the second control module includes: a second processing unit and a third processing unit; the second processing unit is connected with the second AC-DC conversion circuit, and is used for generating the third driving signal in an analog control mode according to a feedback signal of the second AC-DC conversion circuit; the third processing unit is connected with the second dc-dc conversion circuit, and the third processing unit is configured to generate the fourth driving signal in an analog control manner according to a feedback signal of the second dc-dc conversion circuit.

Optionally, the second control module includes: the second AC-DC driving unit and the second DC-DC driving unit; the first processing unit is connected with the second AC-DC driving unit and the second DC-DC driving unit, and is further used for generating a third adjusting signal according to a feedback signal of the second AC-DC converting circuit; generating a fourth regulating signal according to the feedback signal of the second DC-DC conversion circuit; the second AC-DC driving unit is connected with a second AC-DC conversion circuit and is used for generating a third driving signal according to the third adjusting signal; the second direct driving unit is connected with the second direct conversion circuit, and the second direct driving unit is used for generating the fourth driving signal according to the fourth adjusting signal.

Optionally, the second power supply circuit includes: a third DC-DC conversion circuit; the drive signal of the second power supply circuit comprises a fifth drive signal; the input end of the third DC-DC conversion circuit is connected with the output end of the first AC-DC conversion circuit, the output end of the third DC-DC conversion circuit is connected with the mainboard and the accompanying sound element, and the third DC-DC conversion circuit is used for performing voltage conversion on the DC signal output by the first AC-DC conversion circuit according to the fifth driving signal.

Optionally, the second control module includes: a fourth processing unit; the fourth processing unit is connected to the third dc-dc conversion circuit, and the fourth processing unit is configured to generate the fifth driving signal in an analog control manner according to a feedback signal of the third ac-dc conversion circuit.

Optionally, the second control module includes: a third direct drive unit; the first processing unit is connected with the third direct current driving unit, and the first processing unit is further configured to generate a fifth adjusting signal according to a feedback signal of the third direct current conversion circuit; the third direct driving unit is connected with the third direct conversion circuit, and the third direct driving unit is configured to generate the fifth driving signal according to the fifth adjustment signal.

In the display device provided in the embodiment of the application, the first power supply circuit provides a first power supply signal to the backlight assembly according to the received ac input signal, the first control module drives the first power supply circuit in a digital control manner, that is, the first processing unit of the first control module generates an adjustment signal according to the feedback signal of the first power supply circuit, and the first driving unit of the first control module generates a driving signal for driving the first power supply circuit according to the adjustment signal. In the embodiment, the high-power backlight assembly is driven in a digital control mode, so that the control precision is high, the flexibility is good, the high-power backlight assembly can be well suitable for scenes of a high-power display device, and the effective power supply of the backlight assembly is realized.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the embodiments of the application and, together with the description, serve to explain the principles of the embodiments of the application.

Specific embodiments of the present application have been shown by way of example in the drawings and will be described in more detail below. These drawings and written description are not intended to limit the scope of the inventive concepts of the present application in any way, but rather to illustrate the inventive concepts of the embodiments of the present application by those skilled in the art with reference to particular embodiments.

FIG. 1 is a schematic diagram of a display device;

fig. 2 is a schematic structural diagram of a display device according to an embodiment of the present disclosure;

fig. 3 is a schematic structural diagram of another display device provided in an embodiment of the present application;

fig. 4 is a schematic structural diagram of another display device provided in the embodiment of the present application;

FIG. 5 is a schematic diagram of a first processing unit in one example;

fig. 6 is a schematic structural diagram of another display device provided in the embodiment of the present application;

FIG. 7 is a schematic diagram of an exemplary auxiliary circuit;

FIG. 8 is a schematic diagram of an auxiliary circuit in another example;

fig. 9 is a schematic structural diagram of another display device according to an embodiment of the present disclosure;

fig. 10 is a schematic structural diagram of another display device provided in the embodiment of the present application;

fig. 11 is a schematic structural diagram of another display device according to an embodiment of the present disclosure;

fig. 12 is a schematic structural diagram of another display device according to an embodiment of the present application;

fig. 13 is a schematic structural diagram of another display device according to an embodiment of the present application;

fig. 14 is a schematic structural diagram of another display device according to an embodiment of the present application;

fig. 15 is a schematic structural diagram of another display device according to an embodiment of the present application;

fig. 16 is a schematic structural diagram of another display device according to an embodiment of the present application;

fig. 17 is a schematic diagram of a structure of an auxiliary circuit in yet another example.

With the above figures, there are shown specific embodiments of the present application, which will be described in more detail below. The drawings and written description are not intended to limit the scope of the inventive concepts in any manner, but rather to illustrate the concepts of the application by those skilled in the art with reference to specific embodiments.

Detailed Description

Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. The following description refers to the accompanying drawings in which the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the application, as detailed in the appended claims.

In practical applications, a display device integrates a plurality of working modules, for example, the display device usually needs to supply power to an internal motherboard, a sound device, a backlight, and the like. In the related art, the power supply of these modules is usually controlled in an analog manner. Fig. 1 is a schematic structural diagram of a display device, as shown in fig. 1, the display device includes a backlight assembly 11, an analog chip 15 and a power supply circuit 14, the power supply circuit 14 is connected to the backlight assembly 11, and the power supply circuit 14 is used for supplying power to the backlight assembly 11. The analog chip 15 is connected with the power supply circuit 14, and the analog chip 15 controls the power supply circuit in an analog control mode so that the power supply circuit outputs a stable power supply signal.

However, as display technology has been developed, the size of display devices has gradually increased, and thus the power level of switching power supplies used for the display devices has also increased. For high power display devices, the conventional analog control scheme may not be able to satisfy the switching power supply of the high power display device.

The technical means of the present application and the technical means of the present application will be described in detail below with specific examples. The following several specific embodiments may be combined with each other, and details of the same or similar concepts or processes may not be repeated in some embodiments. In the description of the present application, unless otherwise explicitly specified and defined, each term should be understood broadly in the art. Embodiments of the present application will be described below with reference to the accompanying drawings.

Fig. 2 is a schematic structural diagram of a display device according to an embodiment of the present application, and as shown in fig. 2, the display device according to the embodiment includes: a first power supply circuit 20, a first control module 30 and a backlight assembly 11. The first power supply circuit 20 is connected to the backlight assembly 11, and the first power supply circuit 20 is configured to receive an ac input signal and generate a first power supply signal based on the ac input signal, where the first power supply signal is used to supply power to the backlight assembly 11.

In the display device, the backlight assembly 11 is used for providing a light source, the backlight assembly 11 is a main power consumption element of the display device, and the larger the size of the display device is, the larger the required power is, the larger the supply voltage of the backlight assembly 11 is, and the larger the fluctuation of the supply voltage is when influenced by factors such as environment, so that the effective control of increasing the supply voltage of the backlight assembly 11 is realized, which is equivalent to the effective control of the supply voltage of the display device.

It should be noted that the signals mentioned in this embodiment, such as the ac input signal and the first power supply signal, may be voltage signals or current signals, which is not limited in this example. However, for convenience of describing the embodiments of the present application, the signals appearing below are all illustrated by taking voltage signals as examples.

With continued reference to the example of fig. 2, the first control module 30 includes a first driving unit 31 and a first processing unit 32, the first processing unit 32 is connected to the first driving unit 31, and the first processing unit 32 is configured to generate an adjustment signal in a digital signal format according to the feedback signal of the first power supply circuit 20. The first processing Unit 32 is a processor with data calculation and processing functions, and may be, for example, a Micro Controller Unit (MCU) or a Digital Signal processing chip (DSP).

With continued reference to the example of fig. 2, the first driving unit 31 is connected to the first power supply circuit 20, and the first driving unit 31 is configured to generate a driving signal for driving the first power supply circuit 20 according to the adjustment signal. In practical application, the driving signal may be a Pulse Width Modulation (PWM) signal, and the duty ratio of the PWM signal may be adjusted to drive the switching frequency of the switching tube in the first power supply circuit 20, so as to control the output voltage of the first power supply circuit 20. Specifically, the first driving unit 31 converts the adjustment signal in the digital signal format output by the first processing unit 32 into a driving signal capable of driving the first power supply circuit, and the first driving unit 31 is, for example, a converter that converts a digital signal into an analog signal.

In this embodiment, the adjustment signal in the digital signal format is generated based on software control operation written in the first processing unit, and is not limited by hardware, so that the adjustment and control of the driving signal are more flexible, and the adjustment and control precision is higher.

In an example, fig. 3 is a schematic structural diagram of another display device according to an embodiment of the present disclosure, and as shown in fig. 3, the first power supply circuit 20 includes a first ac-dc conversion circuit 21 and a first dc-dc conversion circuit 22, and the first driving unit 31 includes a first ac-dc driving unit 311 and a first dc-dc driving unit 312.

The first processing unit 32 is connected to the first ac/dc driving unit 311 and the first dc driving unit 312. The first processing unit 32 generates a first adjustment signal in a digital signal format according to the feedback signal of the first ac-dc conversion circuit 21, and the first processing unit 32 generates a second adjustment signal according to the feedback signal of the first dc-dc conversion circuit 22.

With reference to fig. 3, the first ac/dc driving unit 311 is connected to the first ac/dc converting circuit 21, the first ac/dc driving unit 311 is configured to generate a first driving signal for driving the first ac/dc converting circuit 21 according to the first adjusting signal, and the first ac/dc converting circuit 21 is configured to convert the received ac signal into a dc signal based on the first driving signal.

With reference to fig. 3, the first dc/dc conversion unit 312 is connected to the first dc/dc conversion circuit 22, the first dc/dc conversion unit 312 is configured to generate a second driving signal for driving the first dc/dc conversion circuit 22 according to the second adjustment signal, and the first dc/dc conversion circuit 22 is configured to perform voltage conversion on the received dc signal based on the second driving signal.

The first ac-dc converter circuit 21 and the first dc-dc converter circuit 22 will be described as an example.

Fig. 4 is a schematic structural diagram of another display device according to an embodiment of the present disclosure, and as shown in fig. 4, the first ac-dc converting circuit 21 includes a bridge rectifying circuit 211, a first inductor 212, a first switching tube 214 and a first capacitor 213, wherein an input end of the bridge rectifying circuit 211 receives an ac input signal, and an output end of the bridge rectifying circuit 211 is connected to one end of the first inductor 212. The other end of the first inductor 212 is connected to one end of a first switch tube 214, the other end of the first switch tube 214 is connected to the bridge rectifier circuit 211, the control end of the first switch tube 214 is connected to the output end of the first ac/dc driving unit 311, and the input end of the first ac/dc driving unit 311 is connected to the first processing unit 32.

In operation, with reference to fig. 4, the bridge rectifier circuit 211 converts the received ac input signal into a dc signal, and the first processing unit 32 generates a first adjustment signal in digital signal format based on the feedback signal of the first ac/dc conversion circuit 21. The first ac/dc driving unit 311 converts the first adjustment signal into a first driving signal, and the first driving signal controls the first switch tube 214 to be turned on or off, when the first switch tube 214 is turned on, the first inductor 212 generates an induced electromotive force, and the first capacitor 213 is charged. When the first switch tube 214 is turned off, the first capacitor 213 is discharged. Therefore, the voltage of the first capacitor 213 can be regulated by controlling the switching frequency of the first switch tube through the first driving signal, and the voltage of the first capacitor 213 is the output voltage of the first ac-dc converting circuit 21. Therefore, the circuit can realize fast regulation and control of the first ac-dc converting circuit 21 to ensure the stability of the output voltage of the first ac-dc converting circuit 21.

With reference to fig. 4, the first dc-dc conversion circuit 22 includes a second switch 223, a second inductor 221, a second capacitor 222 and a transformer, wherein one end of the second switch 223 is connected to one end of the first capacitor 213, the other end of the second switch 223 is connected to the other end of the first capacitor 213, and a control end of a field of the second switch 223 is connected to the first dc driving unit 312. One end of the second inductor 221 is connected to one end of the second switching tube 223, and the other end of the second inductor 221 is connected to the primary input end of the first transformer 224. One end of the second capacitor 222 is connected to the primary output end of the first transformer 224, and the other end of the second capacitor 222 is connected to the other end of the second switch tube 223.

In operation, the first processing unit 32 generates a second adjustment signal in a digital signal format based on the feedback signal of the voltage of the first dc-to-dc conversion circuit 22, and the first dc-to-dc driving unit 312 controls the on/off of the second switch 223 according to the second adjustment signal, so as to control the voltage across the second capacitor 222, and transforms the voltage across the second capacitor 222 into the voltage required by the backlight assembly 11 through the first transformer 224. Therefore, the circuit can realize fast regulation and control of the first dc-dc conversion circuit 22 to ensure the stability of the output voltage of the first dc-dc conversion circuit 22.

In this example, the received ac signal is converted into a dc signal by a first ac-dc conversion circuit; and performing voltage conversion on the received direct current signal through the first alternating current-direct current conversion circuit to output an adaptive power supply signal of the backlight assembly, thereby ensuring the stable operation of the display device.

An example of the first processing unit 32 will be described below.

Fig. 5 is a schematic structural diagram of the first processing unit 32 in an example, and as shown in fig. 5, the first processing unit 32 includes a processing element 325, a first sampling unit 321, a second sampling unit 322, a first comparing unit 323, and a second comparing unit 324.

The input end of the first sampling unit 321 is connected to the output end of the first ac-dc converting circuit 21, and the first sampling unit 321 is configured to sample the output voltage of the first ac-dc converting circuit 21 as the first feedback signal. For example, the first sampling unit 321 may include an Analog-to-Digital converter (ADC), and similarly, the second sampling unit 322 may also include an ADC. In practical applications, the voltage that the first processing unit 32 can bear generally does not exceed 4V, and therefore the output voltage cannot be directly used as the feedback signal, and therefore the first sampling unit 321 can output the output voltage of the first ac-dc converting circuit 21 according to a certain ratio. Similarly, the second sampling unit 322 may output the output voltage of the first dc-dc conversion circuit 22 according to a certain ratio.

With continued reference to fig. 5, an input terminal of the first comparing unit 323 is connected to an output terminal of the first sampling unit 321, an output terminal of the first comparing unit 323 is connected to the processing element 325, and the first comparing unit 323 is configured to compare the first feedback signal with a predetermined first reference signal and output a first comparison result; a processing element 325 for generating a first adjustment signal based on the first comparison result.

The Processing element 325 may be a Central Processing Unit (CPU). The first reference signal may be set according to a rated voltage of the backlight assembly 11 of the display device. In combination with the above example in which the first feedback signal is output at a certain ratio, the first reference signal is also set at the same ratio. For example, the rated voltage of the display device is 300V, and the set first reference signal is set to 3V. Similarly, the output signal of the first ac-dc conversion circuit 21 is reduced by 100 times to be used as the first feedback signal.

In this example, the first comparing unit 323 compares the first feedback signal sampled by the first sampling unit 321 with the first reference signal, which may be understood as a comparison between numbers, and inputs the first comparison result to the processing element 325. The processing element 325 generates a first adjustment signal based on the first comparison.

For example, the first feedback signal is 2.9V, the first reference signal is 3V, the first comparing unit 323 inputs the difference value of 0.1V into the CPU, the CPU outputs the first adjusting signal in the digital signal format according to the difference value, the first driving unit 31 converts the first adjusting signal in the digital signal format into the PWM signal, and increases the duty ratio of the PWM signal, so as to increase the output voltage of the first ac-dc converting circuit 21. In practice, the operation may be based on binary numbers.

With continued reference to fig. 5, likewise, an input terminal of the second sampling unit 322 is connected to the output terminal of the first dc-to-dc conversion circuit 22, and the second sampling unit 322 is configured to sample the output voltage of the first dc-to-dc conversion circuit 22 and output the second feedback signal in the form of a digital signal. The input terminal of the second comparing unit 324 is connected to the output terminal of the second sampling unit 322, the output terminal of the second comparing unit 324 is connected to the processing element 325, and the second comparing unit 324 is configured to compare the sampled second feedback signal with a predetermined second reference signal and output a second comparison result. A processing element 325 for generating a second adjustment signal depending on the second comparison result. Likewise, the second comparing unit 324 compares the second feedback signal sampled by the second sampling unit 322 with the second reference signal, which may be understood as a comparison between numbers, and inputs the second comparison result to the processing element 325, and the processing element 325 generates the second adjustment signal according to the second comparison result.

In this example, the first feedback signal and the second feedback signal obtained by the first sampling unit and the second sampling unit are output through the first comparing unit, the second comparing unit and the processing element, and the first adjusting signal and the second adjusting signal in the digital signal format are output, so that the first power supply circuit can be driven in a flexible and high-precision control manner, and thus, effective power supply to the backlight assembly can be realized in a scene of a high-power display device.

It should be noted that the implementation form of the first control module in this embodiment may be designed according to actual situations. For example, the first control module may be a separate module detachably mounted in the display device. Because the first control module is driven in a digital control mode, the adaptation range of the load is wider. Therefore, in some scenes with large power change of the backlight assembly, the first control module can drive the first power supply circuit to output adaptive voltages of the backlight assembly with different powers without replacing hardware. Of course, the first control module can also be integrated in the display device and integrated with the display device into a whole, so that the display device can be conveniently installed.

In the display device provided in the embodiment of the application, the first power supply circuit provides a first power supply signal to the backlight assembly according to the received ac input signal, the first control module drives the first power supply circuit in a digital control manner, that is, the first processing unit of the first control module generates an adjustment signal according to the feedback signal of the first power supply circuit, and the first driving unit of the first control module generates a driving signal for driving the first power supply circuit according to the adjustment signal. In the embodiment, the high-power backlight assembly is driven in a digital control mode, so that the control precision is high and the flexibility is good, and the high-power backlight assembly is well suitable for scenes of high-power display devices and realizes effective power supply of the backlight assembly. Fig. 6 is a schematic structural diagram of another display device provided in the embodiment of the present application, and as shown in fig. 6, on the basis of the foregoing embodiment, the display device provided in the embodiment of the present application further includes an auxiliary power supply 40.

The input end of the auxiliary power source 40 is connected to the input end of the first power supply circuit 20, the output end of the auxiliary power source 40 is connected to the first control module 30, the auxiliary power source 40 is configured to receive an ac input signal and generate a first auxiliary power supply signal based on the ac input signal, and the first auxiliary power supply signal is configured to supply power to the first control module 30.

In practical applications, the first processing unit and the first driving unit of the first control module both need to be powered. The auxiliary power supply in this embodiment can ensure the power supply requirement of the first control module, and the auxiliary power supply supplies power by using the ac input signal without receiving a power supply signal separately.

In addition, in some examples, fig. 7 is a schematic structural diagram of an auxiliary circuit in an example, and as shown in fig. 7, the auxiliary power supply 40 includes: a first resistor 43. One end of the first resistor 43 is connected to the input end of the first power supply circuit 20, and the other end of the first resistor 43 is connected to the first control module 30. The first resistor 43 is used for sharing the ac input voltage to avoid the phenomenon that the first control module 30 is damaged due to the input of an excessive current.

Based on the above example, in an example, with continued reference to fig. 7, the auxiliary power supply 40 further includes: a light coupling element 41 and a first switching element 42.

In this example, a control terminal of the first switching element 42 receives the standby signal, one end of the first switching element 42 is connected to a primary side output terminal of the optical coupler element 41, the other end of the first switching element 42 is grounded, and the first switching element 42 is configured to be turned on when the standby signal is in a first state; and off when the standby signal is in the second state.

Wherein the standby signal may be provided by the main board 12 of the display device. The first state representation display device is in a working state, and the second state representation display device is in a standby state. For example, the second state is a low level when the first state is a high level, but the second state may be a high level when the first state is a low level, which is not limited in this example.

With continued reference to fig. 7, the primary input terminal of the optical coupler element 41 receives a first level signal, and the first level signal is used to supply power to the primary circuit of the optical coupler element 41. The secondary input end of the optical coupler element 41 is connected to the other end of the first resistor 43, and the secondary output end of the optical coupler element 41 is connected to the first control module 30. The first level signal is a continuous signal, and may be an ac input signal, or may be provided by an external power supply device, which is not limited in this example.

The working process of this example is: when the display device is in the working state, the first switching element 42 receives the standby signal in the first state, and when the first switching element 42 is turned on, the optocoupler 41 is turned on, and the first control module 30 normally works; when the display device is in the standby state, the first switching element 42 receives the standby signal in the second state, and the first switching element 42 is turned off, the optical coupler element 41 is turned off, and the first control module 30 stops working.

The display device realizes that the auxiliary power supply is switched on when the display device works and is switched off when the display device is in a standby state, reduces the power consumption of the first control module, and further reduces the power consumption of the display device in the standby state.

On the basis of the above example, fig. 8 is a schematic structural diagram of an auxiliary circuit in another example, and as shown in fig. 8, the auxiliary power supply 40 further includes: a second resistor 44, a third resistor 45 and a third capacitor 47. One end of the second resistor 44 receives the standby signal, and the other end of the second resistor 44 is connected to the control end of the first switch element 42. The second resistor 44 is used for sharing the voltage to prevent the first switching element 42 from being subjected to an excessively high voltage. One end of the third resistor 45 is connected to the control end of the first switching element 42, and the other end of the third resistor 45 is connected to the other end of the first switching element 42. The third resistor 45 is used for pulling down the voltage at the other end of the first switch element 42 to prevent the other end of the first switch element 42 from floating when the first switch element 42 is turned off. One end of the third capacitor 47 is connected to one end of the third resistor 45, and the other end of the third capacitor 47 is connected to the other end of the third resistor 45. The third capacitor 47 is used to filter the higher frequency signal to avoid affecting the first switching element 42.

Thus, in this example, the reliability of the operation of the auxiliary power supply 40 is ensured by the first resistor, the second resistor, and the first capacitor.

In addition, with reference to fig. 8, the auxiliary power source 40 may further include a fourth resistor 46, one end of the fourth resistor 46 receives the first level signal, and the other end of the fourth resistor 46 is connected to the primary input end of the optical coupler element 41. The fourth resistor 46 is used for sharing the voltage of the optical coupler element 41, so as to avoid the voltage applied by the optical coupler element 41 from being too large.

In some examples, fig. 9 is a schematic structural diagram of another display device provided in an embodiment of the present application, and as shown in fig. 9, the device further includes a second switching element 50, one end of the second switching element 50 receives an ac input signal, the other end of the second switching element 50 is connected to an input end of the first power supply circuit 20, and a control end of the second switching element 50 receives a control signal. The control terminal of the second switch element 50 may be connected to the main board 12, and the second switch element 50 is configured to be turned on when receiving a signal that the display apparatus is in an operating state, and turned off when receiving a signal that the display apparatus is in an off state or in a standby state. This example realizes the off control of the first power supply circuit, and in conjunction with the example in which the display device includes the auxiliary power supply, the second switching element can also control the auxiliary power supply, so this example improves the controllability of the first power supply circuit.

Fig. 10 is a schematic structural diagram of another display device provided in the embodiment of the present application, and as shown in fig. 10, on the basis of the foregoing embodiment, the display device provided in the embodiment further includes: a second power supply circuit 60, a second control module 70, a main board 12 and an audio element 13.

The second power supply circuit 60 is connected to the motherboard 12 and the audio component 13, the second power supply circuit 60 is configured to receive an ac input signal and generate a second power supply signal and a third power supply signal based on the ac input signal, the second power supply signal is configured to supply power to the motherboard 12, and the third power supply signal is configured to supply power to the audio component 13.

The main board 12 is a control circuit of the display device, and can control the operating state of the display device, such as standby, operation and power-off, based on the user's requirement. And provides signals to other systems to display the operating status of the device. In practical applications, the display device needs to be powered continuously in both standby and working states, and the rated voltage of the main board 12 is generally 12V.

The sound accompanying element 13 is an element for providing sound volume when the display device works, and can supply power when the display device works and cut off power when the display device is in standby. The sound element 13 is typically rated at 18V.

With continued reference to fig. 10, the second control module 70 is connected to the second power supply circuit 60, and the second control module 70 is configured to generate a driving signal for driving the second power supply circuit 60 according to the feedback signal of the second power supply circuit 60.

In the display device provided by this example, the second control module generates the driving signal according to the feedback voltage of the second power supply circuit, and the second power supply circuit regulates and controls the output voltage through the driving signal to provide a stable power supply signal for the main board and the sound accompanying element, so that the stable operation of the display device can be ensured.

It should be noted that in this example, since the main board needs to be continuously powered and the audio element does not work when the display device does not work, the second power supply circuit does not need to be powered off when the display device does not work.

In an example, fig. 11 is a schematic structural diagram of another display device provided in the embodiment of the present application, and as shown in fig. 11, the second power supply circuit 60 includes: a second ac-dc conversion circuit 61 and a second dc-dc conversion circuit 62; the driving signals of the second power supply circuit 60 include a third driving signal and a fourth driving signal; wherein the third driving signal and the fourth driving signal may be square wave signals.

With continued reference to fig. 11, an input terminal of the second ac-dc converting circuit 61 is connected to an input terminal of the first power supply circuit 20, and the second ac-dc converting circuit 61 is configured to convert the received ac input signal into a dc signal according to the third driving signal. The second ac-dc conversion circuit 61 is similar to the first ac-dc conversion circuit 21, and the specific structure can refer to the first ac-dc conversion circuit 21, which is not described herein again.

The input end of the second dc-dc conversion circuit 62 is connected to the output end of the second ac-dc conversion circuit 61, the output end of the second dc-dc conversion circuit 62 is connected to the main board 12 and the audio element 13, and the second dc-dc conversion circuit 62 is configured to perform voltage conversion on the received dc signal according to the fourth driving signal. The second dc-to-dc conversion circuit 62 is similar to the first dc-to-dc conversion circuit 22, and can be referred to as the first dc-to-dc conversion circuit 22.

It should be noted that the second dc-dc conversion circuit 62 includes a second transformer for converting the dc signal into a second power supply signal and a third transformer for converting the dc signal into a third power supply signal. Of course, the second transformer and the third transformer may be connected to the auxiliary power source 40 in the above example, and the primary side and the secondary side of the second transformer and the third transformer are powered by the auxiliary power source 40.

In this example, the second ac-dc conversion circuit converts the input ac input signal into a dc signal according to the third driving signal, and the second dc-dc conversion circuit converts the dc signal into the second power supply signal and the third power supply signal respectively according to the fourth driving signal, so as to ensure stable operation of the motherboard and the audio component.

On the basis of the above example, in an implementation manner, fig. 12 is a schematic structural diagram of another display device provided in an embodiment of the present application, and as shown in fig. 12, the second control module 70 includes: a second processing unit 71 and a third processing unit 72.

The second processing unit 71 is connected to the second ac-dc converting circuit 61, and the second processing unit 71 is configured to generate the third driving signal in an analog control manner according to the feedback signal of the second ac-dc converting circuit 61. The third processing unit 72 is connected to the second dc-dc conversion circuit 62, and the third processing unit 72 is configured to generate a fourth driving signal in an analog control manner according to a feedback signal of the second dc-dc conversion circuit. The second processing unit and the third processing unit may be analog chips. For the third driving signal and the fourth driving signal, the related art can be referred to.

In the example, the third driving signal and the fourth driving signal are generated based on an analog control mode, and the power supply voltage of the main board (12V) and the sound element (18V) is relatively small and fixed. Thus, based on the third drive signal generated by the second processing unit and the fourth drive signal generated by the third processing unit, a control of the output voltage of the second supply circuit can be achieved. Therefore, the third driving signal and the fourth driving signal are generated in an analog control mode on the basis of ensuring effective power supply to the backlight assembly, and the circuit structure of the display device is simplified.

In another embodiment, fig. 13 is a schematic structural diagram of another display device provided in an embodiment of the present application, and as shown in fig. 13, the second control module 70 includes: a second ac-dc drive unit 74 and a second dc-dc drive unit 75. The first processing unit 32 is connected to the second ac-dc driving unit 74 and the second dc-dc driving unit 75, and the first processing unit 32 is configured to generate a third adjustment signal in a digital signal format according to the feedback signal of the second ac-dc converting circuit 61; and, a fourth adjustment signal in a digital signal format is generated from the feedback signal of the second dc-dc conversion circuit 62.

With reference to fig. 13, the second ac/dc driving unit 74 is connected to the second ac/dc converting circuit 61, and the second ac/dc driving unit 74 is configured to generate a third driving signal for driving the second ac/dc converting circuit 61 according to the third adjusting signal. The second dc/dc driving unit 75 is connected to the second dc/dc converting circuit 62, and the second dc/dc driving unit 75 is configured to generate a fourth driving signal for driving the second dc/dc converting circuit 62 according to the fourth adjusting signal.

In this example, the third adjustment signal and the fourth adjustment signal are in a digital signal format, and it can be understood that the third driving signal and the fourth driving signal are generated in a digital control manner, so that the influence of environmental factors on the third driving signal and the fourth driving signal is reduced in this example, and further, the third power supply signal and the fourth power supply signal can be effectively controlled, so as to further ensure the stability of the operation of the display device.

In an example, fig. 14 is a schematic structural diagram of another display device provided in an embodiment of the present application, and as shown in fig. 14, the second power supply circuit 60 includes: a third dc-dc conversion circuit 63; the drive signal of the second power supply circuit 60 includes a fifth drive signal;

the input end of the third dc-dc conversion circuit 63 is connected to the output end of the first ac-dc conversion circuit 21, the output end of the third dc-dc conversion circuit 63 is connected to the main board 12 and the audio element 13, and the third dc-dc conversion circuit 63 is configured to perform voltage conversion on the dc signal output by the first ac-dc conversion circuit 21 according to the fifth driving signal.

In this example, the second power supply circuit includes the third dc-dc conversion circuit, and compared with the example in which the second power supply circuit includes the second ac-dc conversion circuit and the second dc-dc conversion circuit, the example shares the first ac-dc conversion circuit, thereby saving one ac-dc conversion circuit, simplifying the structure of the power supply circuit, reducing the influence caused by uncertain factors, and further more effectively controlling the output voltage of the second power supply circuit.

In an implementation manner based on the above example, fig. 15 is a schematic structural diagram of another display device provided in an embodiment of the present application, and as shown in fig. 15, the second control module 70 includes: a fourth processing unit 73;

the fourth processing unit 73 is connected to the third dc-dc converting circuit 63, and the fourth processing unit 73 is configured to generate a fifth driving signal by an analog control manner according to a feedback signal of the third dc-dc converting circuit 63.

Wherein the fourth processing unit may be an analog chip. The specific generation process for the fifth drive signal may refer to the related art. In this example, the fifth driving signal of the third direct driving circuit is generated based on an analog control manner, and can be generated to control the second power supply signal and the third power supply signal, so as to ensure stable operation of the main board and the audio component.

In another embodiment, fig. 16 is a schematic structural diagram of another display device provided in an embodiment of the present application, and as shown in fig. 16, the second control module 70 includes: a third straight drive unit 76;

the first processing unit 32 is connected to the third dc-to-dc conversion circuit 63, and the first processing unit 32 is configured to generate a fifth adjustment signal in a digital signal format according to a feedback signal of the third dc-to-dc conversion circuit 63;

an input end of the third dc driving unit 76 is connected to the first processing unit 32, an output end of the third dc driving unit 76 is connected to the third dc-to-dc converting circuit 63, and the third dc driving unit 76 is configured to generate a fifth driving signal according to the fifth adjusting signal.

In this example, the fifth driving signal of the third dc-dc driving circuit is generated based on the fifth adjusting signal in the digital signal format, and is also generated by a control algorithm of software, so that the present example can reduce the influence of environmental factors on the fifth adjusting signal, and further can further ensure the stability of the second power supply signal and the third power supply signal.

It should be noted that, in the examples shown in fig. 15 and fig. 16, since the main board is connected to the first ac-dc converting circuit, since the auxiliary power supply is controlled by the standby signal, when the display device is in the standby state, the auxiliary power supply stops supplying power to the control module, and at this time, the first ac-dc converting circuit stops working, so that the main board is powered off. In order to enable the main board to work normally in the standby state, in an example, with reference to fig. 16, the apparatus further includes: a zener diode 49. The anode of the zener diode 49 is connected to the auxiliary power supply 40, the cathode of the zener diode 49 is connected to the main board 12 of the display device, and the auxiliary power supply 40 is further configured to output a second auxiliary power supply signal to the zener diode 49, where the second auxiliary power supply signal is lower than a rated power supply signal of the main board 12. Wherein the second auxiliary power supply signal may be 9V-11V.

Fig. 17 is a schematic diagram of a structure of an auxiliary circuit in yet another example, and as shown in fig. 17, the auxiliary power supply 40 further includes: one end of the fifth resistor 48 receives the ac input signal, the other end of the fifth resistor 48 is connected to the anode of the zener diode 49, and the cathode of the zener diode 49 is connected to the motherboard 12.

In this example, the main board 12 is connected to the auxiliary power source 40 through the zener diode 49, so that when the second power supply circuit of the main board 12 cannot provide the second power supply signal, the auxiliary power source 40 can supply power to the main board 12 alone. When the power supply circuit normally supplies power to the motherboard 12, the auxiliary power supply 40 does not supply power to the motherboard 12 because the second auxiliary power supply signal is smaller than the rated power supply signal of the motherboard 12 and passes through the unidirectional action of the zener diode 49. Therefore, the display device can ensure that the mainboard can keep a working state under the condition that the power supply circuit is disconnected, and further ensures the stable operation of the display device.

Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the application being indicated by the following claims.

It will be understood that the present application is not limited to the precise arrangements that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the application is limited only by the appended claims.

Claims

1. A display device, comprising:

a backlight assembly for providing a backlight;

the first power supply circuit is connected with the backlight assembly and is used for receiving an alternating current input signal and generating a first power supply signal based on the alternating current input signal; the first power supply signal is used for supplying power to the backlight assembly;

the first control module comprises a first driving unit and a first processing unit, the first processing unit is connected with the first driving unit, and the first processing unit is used for generating an adjusting signal in a digital signal format according to a feedback signal of the first power supply circuit; the first driving unit is connected with the first power supply circuit, and the first driving unit is used for generating a driving signal for driving the first power supply circuit according to the adjusting signal.

2. The display device according to claim 1, wherein the first power supply circuit comprises a first ac-dc conversion circuit and a first dc-dc conversion circuit, and the first driving unit comprises a first ac-dc driving unit and a first dc-dc driving unit;

the first processing unit is connected with the first AC-DC driving unit and the first DC-DC driving unit, and is used for generating a first adjusting signal in a digital signal format according to a feedback signal of the first AC-DC conversion circuit; generating a second regulating signal according to the feedback signal of the first direct-current conversion circuit;

the first ac-dc driving unit is connected to a first ac-dc converting circuit, the first ac-dc driving unit is configured to generate a first driving signal for driving the first ac-dc converting circuit according to the first adjusting signal, and the first ac-dc converting circuit is configured to convert a received ac signal into a dc signal based on the first driving signal;

the first direct-current drive unit is connected with a first direct-current conversion circuit, the first direct-current drive unit is used for generating a second drive signal for driving the first direct-current conversion circuit according to the second adjustment signal, and the first direct-current conversion circuit is used for performing voltage conversion on a received direct-current signal based on the second drive signal.

3. The display device according to claim 2, wherein the first processing unit includes:

the input end of the first sampling unit is connected with the output end of the first AC-DC conversion circuit, and the first sampling unit is used for sampling the output voltage of the first AC-DC conversion circuit as a first feedback signal;

the input end of the first comparison unit is connected with the output end of the first sampling unit, the output end of the first comparison unit is connected with the processing element, and the first comparison unit is used for comparing the first feedback signal with a preset first reference signal and outputting a first comparison result;

the input end of the second sampling unit is connected with the output end of the first direct-current conversion circuit, and the second sampling unit is used for sampling the output voltage of the first direct-current conversion circuit as a second feedback signal;

the input end of the second comparison unit is connected with the output end of the second sampling unit, the output end of the second comparison unit is connected with the processing element, and the second comparison unit is used for comparing the sampled second feedback signal with a preset second reference signal and outputting a second comparison result;

a processing element to generate a first adjustment signal based on the first comparison result and a second adjustment signal based on the second comparison result.

4. The display device according to claim 1, wherein the display device further comprises an auxiliary power supply;

the input end of the auxiliary power supply is connected with the input end of the first power supply circuit, the output end of the auxiliary power supply is connected with the first control module, the auxiliary power supply is used for receiving the alternating current input signal and generating a first auxiliary power supply signal based on the alternating current input signal, and the first auxiliary power supply signal is used for supplying power to the first control module.

5. The display device according to claim 4, wherein the auxiliary power supply comprises: a first resistor;

one end of the first resistor is connected with the input end of the first power supply circuit, and the other end of the first resistor is connected with the first control module.

6. The display device according to claim 5, wherein the auxiliary power supply further comprises: a light coupling element and a first switching element;

a control end of the first switching element receives a standby signal, one end of the first switching element is connected with a primary side output end of the optical coupler element, the other end of the first switching element is grounded, and the first switching element is used for being conducted when the standby signal is in a first state; and to turn off when the standby signal is in a second state;

the primary side input end of the optical coupling element receives a first level signal, the secondary side input end of the optical coupling element is connected with the other end of the first resistor, and the secondary side output end of the optical coupling element is connected with the first control module.

7. The display device according to claim 6, wherein the auxiliary power supply further comprises:

one end of the second resistor receives the standby signal, and the other end of the second resistor is connected with the control end of the first switch element;

one end of the third resistor is connected with the control end of the first switch element, and the other end of the third resistor is connected with the other end of the first switch element;

and one end of the first capacitor is connected with one end of the third resistor, and the other end of the first capacitor is connected with the other end of the third resistor.

8. The display device according to claim 6, wherein the device further comprises: a voltage regulator diode;

the anode of the voltage stabilizing diode is connected with the auxiliary power supply, the cathode of the voltage stabilizing diode is connected with the mainboard of the display device, the auxiliary power supply is further used for outputting a second auxiliary power supply signal to the voltage stabilizing diode, and the second auxiliary power supply signal is lower than a rated power supply signal of the mainboard.

9. The device according to any one of claims 1 to 8, further comprising a second switching element, wherein one end of the second switching element receives the ac input signal, the other end of the second switching element is connected to the input terminal of the first power supply circuit, and a control terminal of the second switching element receives a control signal.

10. The display device according to any one of claims 1 to 8, wherein the device further comprises a second power supply circuit, a second control module, a main board, and an audio element;

the second power supply circuit is connected with the mainboard and the sound element, and is used for receiving an alternating current input signal and generating a second power supply signal and a third power supply signal based on the alternating current input signal, wherein the second power supply signal is used for supplying power to the mainboard, and the third power supply signal is used for supplying power to the sound element;

the second control module is connected with the second power supply circuit and used for generating a driving signal for driving the second power supply circuit according to the feedback signal of the second power supply circuit.

11. The display device according to claim 10, wherein the second power supply circuit comprises: a second AC-DC converting circuit and a second DC-DC converting circuit; the driving signals of the second power supply circuit comprise a third driving signal and a fourth driving signal;

the input end of the second AC-DC conversion circuit is connected with the input end of the first power supply circuit, and the second AC-DC conversion circuit is used for converting the received AC input signal into a DC signal according to the third driving signal;

the input end of the second direct-current and direct-current conversion circuit is connected with the output end of the second alternating-current and direct-current conversion circuit, the output end of the second direct-current and direct-current conversion circuit is connected with the mainboard and the accompanying sound element, and the second direct-current and direct-current conversion circuit is used for performing voltage conversion on the received direct-current signal according to the fourth driving signal.

12. The display device according to claim 11, wherein the second control module comprises: a second processing unit and a third processing unit;

the second processing unit is connected with the second AC-DC conversion circuit, and is used for generating the third driving signal in an analog control mode according to a feedback signal of the second AC-DC conversion circuit;

the third processing unit is connected with the second direct-current conversion circuit, and the third processing unit is configured to generate the fourth driving signal in an analog control manner according to a feedback signal of the second direct-current conversion circuit.

13. The display device according to claim 11, wherein the second control module comprises: the second AC-DC driving unit and the second DC-DC driving unit;

the first processing unit is connected with the second AC-DC driving unit and the second DC-DC driving unit, and is further used for generating a third adjusting signal according to a feedback signal of the second AC-DC converting circuit; generating a fourth regulating signal according to a feedback signal of the second direct-current-direct-current conversion circuit;

the second ac-dc driving unit is connected to the second ac-dc converting circuit, and the second ac-dc driving unit is configured to generate the third driving signal according to the third adjusting signal; the second direct driving unit is connected with the second direct conversion circuit, and the second direct driving unit is used for generating the fourth driving signal according to the fourth adjusting signal.

14. The display device according to claim 10, wherein the second power supply circuit comprises: a third DC-DC conversion circuit; the drive signal of the second power supply circuit comprises a fifth drive signal;

the input end of the third DC-DC conversion circuit is connected with the output end of the first AC-DC conversion circuit, the output end of the third DC-DC conversion circuit is connected with the mainboard and the accompanying sound element, and the third DC-DC conversion circuit is used for performing voltage conversion on the DC signal output by the first AC-DC conversion circuit according to the fifth driving signal.

15. The display device according to claim 14, wherein the second control module comprises: a fourth processing unit;

the fourth processing unit is connected to the third dc-dc conversion circuit, and the fourth processing unit is configured to generate the fifth driving signal in an analog control manner according to a feedback signal of the third ac-dc conversion circuit.

16. The display device according to claim 14, wherein the second control module comprises: a third direct drive unit;

the first processing unit is connected with the third direct-current driving unit, and is further configured to generate a fifth adjusting signal according to a feedback signal of the third direct-current conversion circuit;

the third dc-dc driving unit is connected to the third dc-dc converting circuit, and the third dc-dc driving unit is configured to generate the fifth driving signal according to the fifth adjusting signal.